Módulo:Pn

--[[
Module that returns one value from a list of unnamed parameters
Named parameter idx is the index of the parameter that is to be returned
Negative indices count backward from the end of the list
==]]

local p = {}

p.getVal = function(frame)
    local args = {}
    -- copy arguments from frame object and its parent
    for k, v in pairs(frame.args) do
        args[k] = v
    end
    for k, v in pairs(frame:getParent().args) do
        args[k] = v
    end
    if not args[1] then
        return nil
    end
    local idx = tonumber(args.idx) or 1
    if idx < 0 then idx = #args + idx + 1 end
    return args[idx]
end

return p
Exemplos
